Light ergonomics
# Light ergonomics

Light ergonomics is the relationship between the light source and the individual. Poor light can be divided into the following:

* Individual or socio-cultural expectations
* Insufficient light
* Poor distribution of light
* Improper contrast
* Glare
* Flicker
* Thermal heating (over or under)
* Acoustic noise (especially fluorescents)
* Color spectrum (full-spectrum light, color temperature, etc.)

## Effects of poor light

The effects of poor light can include the following:

* low productivity
* high human error rates
* inability to match or select correct colors
* eyestrain
* headache
* a reduction in mental alertness
* general malaise
* low employee morale

    Recommended Illumination Levels Type of ActivityRanges of Illuminations (Lux) Public spaces with dark surroundings30 Simple orientation for short temporary visits50 Working spaces where visual tasks are only occasionally performed100 Performance of visual tasks of high contrast or large scale300 Performance of visual tasks of medium contrast or small size500 Performance of visual tasks of low contrast or very small size1000 Performance of visual tasks near threshold of person's ability to recognize an image3000-10000

## Types of light sources

    Light Bulbs TypeCommon ApplicationEfficiencyColour RenderingFog-Smog Penetration IncandescentHomesPoorGood FluorescentHome&OfficeGoodFair to good MercuryFactories, officesFairFair to moderate Low pressure sodiumRoadwayGoodPoorGood High pressure sodiumFactories, commercialGoodFair to goodGood Metal HalideFactories, commercialGoodGood Light-emitting diode (LED)Home & office, commercial, industrialExcellentGood
